Replace "python3" in command by sys.executable

[HuangJiameng]

fix #1099

[codecov-commenter]

Codecov Report

Base: 39.55% // Head: 46.06% // Increases project coverage by +6.51% 🎉

Coverage data is based on head (fd9e2a3) compared to base (a9d324b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1105      +/-   ##
==========================================
+ Coverage   39.55%   46.06%   +6.51%     
==========================================
  Files          99       82      -17     
  Lines       17981    14452    -3529     
==========================================
- Hits         7112     6658     -454     
+ Misses      10869     7794    -3075     

Impacted Files	Coverage Δ
dpgen/data/gen.py	51.75% <100.00%> (+0.35%)	⬆️
dpgen/data/surf.py	66.60% <100.00%> (ø)
dpgen/remote/decide_machine.py	87.50% <0.00%> (-4.50%)	⬇️
dpgen/simplify/simplify.py	0.00% <0.00%> (ø)
dpgen/dispatcher/LocalContext.py
dpgen/remote/RemoteJob.py
dpgen/auto_test/lib/SlurmJob.py
dpgen/dispatcher/Batch.py
dpgen/dispatcher/LazyLocalContext.py
dpgen/auto_test/lib/RemoteJob.py
... and 18 more

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